[alwillis]

There are 14.7 million pixels on the iMac's screen. The definition of a retina display is you can't discern individual pixels at normal viewing distances, so unless you're sitting with your nose against the screen or are using a loupe, you won't be able to see a single dead pixel.

[runeks]

> The definition of a retina display is you can't discern individual pixels at normal viewing distances, so unless you're sitting with your nose against the screen or are using a loupe, you won't be able to see a single dead pixel.

Your conclusion does not follow from your premise.

Just because we can't identify individual pixels does not mean a single pixel has no influence. It shapes the overall picture.

If a single dead pixel is not visible at all, why have that pixel there in the first place -- working or not?

I just tested with my iPhone 6 (a 1334x750 px white picture with a single black pixel in the middle of the picture), and the single black pixel is definitely visible. A screenshot of the iPhone showing the picture in question confirms it's a single pixel on the screen.

[thisjepisje]

>The definition of a retina display is you can't discern individual pixels at normal viewing distances

I wonder if this is actually true, the whole "more pixels than photosensitive cells" thing sounds a bit shaky.

[imaginenore]

Yeah, it's nonsense. There are 90-120 million rods and 5-7 million cones in the human retina.

[coldtea]

For one it was never about "more pixels than photosensitive cells".

Second, the number of rods and cones has nothing to do with it.

The "retina" argument was about having smaller than discernible angular pixel sizes, which is true for the majority of people and normal viewing distances.

[FireBeyond]

Put a pattern up. 1 pixel by 1 pixel, white, black, white. You'll see just fine. It won't be "grey".